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Intelligent ultra-low-temperature liquid unloading device and unloading process

A truck unloading device and ultra-low temperature technology, which is applied in gas/liquid distribution and storage, fluid treatment, pressure vessels, etc., can solve the problems of slow unloading speed, the pressure difference between the tank truck and the storage tank cannot be kept relatively constant, and the failure of the unloading pump. Achieve the effects of reducing emissions, reducing cavitation and failure rates, and shortening unloading time

Active Publication Date: 2019-04-19
陕西融科低温设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Regardless of whether it is self-pressurized unloading or unloading pump unloading, the pressure difference between the tank car and the storage tank cannot be maintained relatively constant during the unloading process, resulting in slow unloading speed, and the unloading pump fails due to cavitation and cannot play its due role.

Method used

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  • Intelligent ultra-low-temperature liquid unloading device and unloading process
  • Intelligent ultra-low-temperature liquid unloading device and unloading process
  • Intelligent ultra-low-temperature liquid unloading device and unloading process

Examples

Experimental program
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Effect test

Embodiment 1

[0067] Such as figure 1 As shown, the intelligent ultra-low temperature liquid unloading device of the present invention includes a tank car 1, a cryopump skid 2 and a booster vaporizer 20, and the tank car is provided with a tank car liquid phase interface, a tank car gas phase interface and a pressurized liquid Phase interface, the cryopump skid 2 includes the liquid phase arm 3 of the unloading crane tube, the unloading pipeline 4, the gas phase arm 24 of the unloading crane tube and the gas phase pipeline 18, and the liquid phase interface of the tank truck passes through the liquid phase arm 3 of the unloading crane tube It is connected to one end of the unloading pipeline 4, and the other end of the unloading pipeline 4 is connected to the liquid phase main pipe 11 of the storage tank. The tank car gas phase interface is connected to one end of the gas phase pipeline 18 through the gas phase arm 24 of the unloading crane pipe. The other end of 18 is connected to the gas ...

Embodiment 2

[0074] When the storage tank is an atmospheric storage tank, that is, when the pressure P in the storage tank is 0.1MPa, the process of using the device of the present invention to unload the ultra-low temperature liquid includes:

[0075] Step 1, nitrogen replacement is carried out to the air in each pipeline of the device;

[0076] Step 2: The ultra-low temperature liquid in the tank car 1 enters the liquid phase branch 17 through the unloading pipeline 4 and the first pipeline 19, and then is introduced into the booster gasifier 20 to pressurize the tank car 1. The opening and closing degree of the second valve 13 on the liquid phase branch 17 controls the flow rate of the ultra-low temperature liquid entering the supercharged vaporizer 20, and the pressure in the tank car 1 continues to rise. When the first pressure sensor 5 detects that the tank car 1 internal pressure P 1 When it reaches 0.4MPa~0.8MPa and the dynamic quantity ΔP satisfies the following conditions, the f...

Embodiment 3

[0112] When the storage tank is a pressurized storage tank, that is, when the pressure in the storage tank is 0.4MPa~1.0MPa, the process of using the device of the present invention to unload ultra-low temperature liquid includes:

[0113] Step 1, nitrogen replacement is carried out to the air in each pipeline of the device;

[0114] Step 2: first judge the pressure difference between the storage tank and the tank car 1, when the pressure P in the storage tank is greater than the pressure P in the tank car 1 detected by the first pressure sensor 5 1 , open the fourth valve 16, balance the pressure of the tank car 1 and the storage tank through the gas phase pipeline 18, and close the fourth valve 16 after the pressure is balanced; the ultra-low temperature liquid in the tank car 1 passes through the unloading pipeline 4 and the first pipe The road 19 enters the liquid phase branch 17, and then introduces into the booster gasifier 20 to pressurize the tank car 1. During the sup...

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Abstract

The invention discloses an intelligent ultra-low-temperature liquid unloading device which comprises a tank car, a low-temperature skid mounted pump and a pressurizing vaporizer. A tank car liquid phase interface, a tank car gas phase interface and a pressurizing liquid phase interface are arranged on the tank car. The low-temperature skid mounted pump comprises an unloading crane pipe liquid phase arm, an unloading pipeline, an unloading crane pipe gas phase arm and a gas phase pipeline. The tank car liquid phase interface is connected to one end of the unloading pipeline through the unloading crane pipe liquid phase arm while the other end of the unloading pipeline is connected to a storage tank phase general pipe, the tank car gas phase interface is connected to one end of the gas phasepipeline through the unloading crane pipe gas phase arm while the other end of the gas phase pipeline is connected to a storage tank gas phase general pipe, and a liquid phase branch is arranged on the unloading pipeline. In addition, the invention also discloses a process of unloading the ultra-low-temperature liquid by adopting the device. By adopting the device and the process, a certain pressure difference can be maintained between the tank car and the storage tank in the unloading process, so that the condition that the unloading pump operates normally is ensured, and the unloading speedis also improved.

Description

technical field [0001] The invention belongs to the technical field of ultra-low temperature liquid unloading, and in particular relates to an intelligent ultra-low temperature liquid unloading device and an unloading process. Background technique [0002] At present, the unloading of ultra-low temperature liquid LNG tank trucks generally adopts the self-pressurized unloading or pump unloading mode. The self-pressurized unloading process is simple. Due to the low liquid level of the tank car, the pressurization time is long, and the unloading time is long. A 50 cubic tank tank needs unloading time 3 to 4 hours; if the pump is used to unload the truck, due to the limitation of the outlet diameter of the tank truck, the current domestic tank truck standard liquid outlet diameter is DN50, which limits the flow of LNG. Due to the special properties of ultra-low temperature liquid, It is easy to produce cavitation phenomenon, resulting in the use of unloading pump unloading can n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C7/04F17C13/00F17C13/04F17C13/02
CPCF17C7/04F17C13/00F17C13/025F17C13/026F17C13/04F17C2223/0161F17C2225/0123F17C2221/033Y02E60/32
Inventor 王耀武林海威徐占伟刘肃彦杜利霞
Owner 陕西融科低温设备有限公司
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